Pharmaceutical-grade silica 10kg/bag fumed precipitation method

Pharmaceutical grade silica 10kg/bag Pyrogenic precipitation method Pharmaceutical-grade silica 10kg/bag Pyrogenic precipitation silica EryanghuaguiSilicon Dioxide SiO2-χH2O [14464-46-1] This strain reacts sodium silicate with acids (such as hydrochloric acid, sulfuric acid, phosphoric acid, etc.
) or reacts with salts (such as ammonium chloride, ammonium sulfate, ammonium bicarbonate, etc.
) to produce silicic acid precipitation (i.
e.
, hydrated silica), which is prepared by washing with water, removing impurities, etc
。
According to the calculation of the incandescent product, the SiO2 content shall not be less than 99.
0%.


【Properties】 This product is a white loose powder
.

This product is dissolved in hot sodium hydroxide test solution and insoluble
in water or dilute hydrochloric acid.

【Identification】Take about 5mg of this product, put it in a platinum crucible, add potassium carbonate 200mg, mix well, burn at 600~700 °C for 10 minutes, cool, add water 2ml micro-heat to dissolve, Slowly add ammonium molybdate test solution (take 6.
5g of molybdenic acid, add 14ml of water and concentrated ammonia solution 14.
5ml, shake to dissolve, cool, slowly add the cooled nitrate 32ml and water 40ml of the mixture under stirring, let stand for 48 hours, filter, take the filtrate, that is, obtain) 2ml, the solution appears dark yellow
.

【Inspection】 Particle size Take 10g of this product, according to the particle size and particle size distribution determination method [General 0982 second method (1)] inspection, the amount of test products that pass the No.
7 sieve (125μm) should not be less than 85%.


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